EP4118946A1 - Tondeuse à gazon - Google Patents

Tondeuse à gazon Download PDF

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Publication number
EP4118946A1
EP4118946A1 EP22173069.0A EP22173069A EP4118946A1 EP 4118946 A1 EP4118946 A1 EP 4118946A1 EP 22173069 A EP22173069 A EP 22173069A EP 4118946 A1 EP4118946 A1 EP 4118946A1
Authority
EP
European Patent Office
Prior art keywords
pulley
blade
frame
lawn mower
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22173069.0A
Other languages
German (de)
English (en)
Inventor
Christian RIVOLTA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marina Systems SRL
Original Assignee
Marina Systems SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marina Systems SRL filed Critical Marina Systems SRL
Publication of EP4118946A1 publication Critical patent/EP4118946A1/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/76—Driving mechanisms for the cutters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts

Definitions

  • the present invention relates to a lawn mower of the kind recited in the preamble of claim 1.
  • the present invention relates to a lawn mower configured to be operated on a grass mantle and to cut at least portions of the grass filaments of the mantle.
  • the lawn mower substantially is a motor-driven machine to cut the grass of a mantle, for instance of a garden or meadow, and to keep trimmed said mantle.
  • the lawn mower generally comprises at least a chassis, on which a motor operatively connected to a blade is mounted.
  • the blade is surrounded at least partially by the chassis and is operatively connected with said chassis in such a way that its fulcrum falls at its centre.
  • the blade ends are also sharpened at their final portions, and as a whole the blade may be shaped like the blade of a fan, in such a way that the cut grass may be sucked on rotation and conveyed into a removable basket.
  • the removable basket When the removable basket is provided, it may be connected to the chamber where the blade is moved, through a conveyance duct.
  • the blade instead may be merely isolated in the chamber defined by the chassis.
  • this is preferably provided with movement means such as tracks, wheels of the like.
  • the machine may also comprise a handle, configured so as to allow the user to drive the machine, thus to control the direction along which the mantle is being cut.
  • the cutting section of the machine may additionally comprise a further blade or a conveyor.
  • document US-A-5012633 discloses a lawn mower comprising a blade and a conveyor for substantially rotating in the same direction with different rotation or contrarotating.
  • the machine comprises an epicycloidal transmission on a set of belt connected pulleys.
  • the mechanism transmitting rotations in the opposite direction is obtained only through an epicycloidal transmission.
  • Document US-A-3385043 discloses a lawn mower having a contrarotating double blade, wherein the mechanism transmitting the motion is carried out by a gearbox.
  • Document JP-B-27671577 likewise discloses a machine having a cutting blade and a conveyor fan, both contrarotating driven by a gearbox.
  • the disclosed prior art has some important drawbacks.
  • the technical object of the present invention is to develop a lawn mower being substantially able to substantially prevent at least part of the abovementioned drawbacks.
  • an important object of the invention is to make a lawn mower that for a double blade cutting section includes a simple and efficient motion transmission mechanism.
  • Another important object of the invention is to make a lawn mower, whose maintenance is easier and less prone to failure.
  • measures, values, forms and geometrical references such as verticalness and parallelism
  • measures, values, forms and geometrical references should be understood except for measurement errors or inaccuracies due to production and/or manufacture, and above all for a slight deviation of the value, measure, form or geometrical reference associated therewith.
  • these terms when associated with a value, preferably mean a deviation not greater than 10% of the value.
  • treatment refers to the action and/or process of a computer or similar device of electronic calculation manipulating and/or transforming data represented as physical ones, such as electronic magnitudes of an informatic system and/or memory, into other data likewise represented as physical quantities inside informatic systems, registers or other devices of storage, transmission or display of data.
  • Machine 1 is substantially fitted to allow trimming of a grass mantle. Therefore, the machine is configured to cut the grass filaments of the mantle when interacting therewith.
  • machine 1 comprises a frame 2, movement means 3 and cutting means 4.
  • Frame 2 is substantially the support structure of the components of machine 1.
  • the movement means 3 are connected with the frame 2. Moreover, the movement means 3 are configured to allow the movement of frame 2 on the grass mantle. More particularly, the movement means 3 may comprise various elements, such as tracks or preferably wheels 30. Preferably, the movement means 3 comprise a plurality of wheels, for instance four or even two. Generally, the movement means 3 allow to move the frame 2 on the grass mantle along a movement plane 3a. The movement plane 3a therefore is substantially parallel to the ground on which the grass mantle is extended.
  • the cutting means 4 are then configured to cut at least part of the mantle filaments.
  • the cutting means 4 preferably comprise at least a first blade 40 and a second blade 41.
  • the first blade 40 and the second blade 41 are extending almost parallel to the movement plane 3a.
  • the term "parallel" is not meaning that the blades 40, 41 are strictly and fully parallel to the movement plane 3a, but they may at the most have small inclinations with ground, thus being generally parallel with a good approximation.
  • the blades 40, 41 may define mutually different or even identical extensions.
  • the blades 40, 41 define same extensions parallel to the movement plane 3a.
  • the first blade 40 may have some particular features.
  • the first blade 40 may comprise two cutting portions 40a.
  • the cutting portions 40a substantially are the cutting parts of the first blade 40. Therefore, these are preferably the free ends of the first blade 40.
  • the second blade 41 instead may comprise a second cutting portion 41a.
  • Such a second cutting portion 41a may extend along the second blade 41 along its full length or its major part.
  • the second cutting portion 41a has preferably a corrugated section, and may define a variable, e.g. ragged shape, having inclinations along its extension varying to the movement plane 3a, see Figs. 1-2 .
  • the first blade 40 is arranged between the second blade 41 and the grass mantle, when the machine 1 is operative.
  • the frame 2 may comprise a chamber 20 containing the cutting means 4.
  • the chamber 20 is preferably configured to contain the blades 40, 41, so that these blades are inaccessible outside the chamber 20. Therefore, the chamber 20 may define an opening 20a.
  • the opening 20a faces the grass mantle when the machine 1 is operative. In this way, the blades 40, 41 interact with the grass mantle through the opening 20a.
  • the machine 1 preferably has suitable components to actuate the cutting means 4 and/or the movement means 3.
  • the machine 1 comprises also motor means 5 and transmission means 6.
  • the motor means 5 preferably comprise at least a rotary shaft 50. Therefore, the motor means 5 are configured for a controlled actuation of the rotary shaft 50.
  • the motor means 5 may comprise an internal combustion engine with hand pull starter. Motor means 5 of this kind are in any case well known to an engineer in this field.
  • the motor means 5 may of course comprise means to control the speed of rotation of the rotary shaft 50.
  • the transmission means 6 are configured to move the blades 40, 41.
  • the transmission means 6 advantageously comprise a set of pulleys and belts.
  • the transmission means 6 comprise at least a first pulley 60, a second pulley 61, a third pulley 64, a first belt 62 and a second belt 63.
  • the first pulley 60 is substantially integral with the first blade 40. Moreover, it is loosely connected with the frame 2, so that it may rotate around a main axis 6a. Therefore, the main axis 6a is transversal to the movement plane 3a, e.g. perpendicular to it.
  • the second pulley 61 is substantially integral with the second blade 41. Moreover, the second pulley 61 is loosely connected with the frame 2, concentric with the first pulley 60. Preferably, the second pulley 61 is arranged around part of the first pulley 60.
  • the second blade 41 may rotate around the main axis 6a, independently from the first blade 40.
  • the second blade 41 rotates with a speed different from the speed of the first blade 40.
  • the first belt 62 is configured to be moved by shaft 50, as it will be better explained hereinafter.
  • the belt 62 is connected with the first pulley 60 and defines a first closed path transversal to the main axis 6a.
  • the second belt 63 is also configured to be moved by shaft 50, as it will be better explained hereinafter.
  • the second belt 63 is connected with the second pulley 61 and defines a second closed path transversal to the main axis 6a.
  • the third pulley 64 is also loosely connected with the frame 2 so as to rotate around a second axis 6b.
  • the second axis 6b is substantially parallel to the main axis 6a.
  • the shaft 50 therefore is integrally constrained with a pulley as preferred, either the first pulley 60 or the third pulley 64.
  • the shaft 50 can transmit its rotation to all the pulleys 60, 61, 64 of the transmission means 6.
  • the first belt 62 surrounds the first pulley 60 and the third pulley 64, so that both pulleys 60, 64 are enclosed in the first closed path, and consequently may rotate proportionally in the same direction.
  • the second belt 63 surrounds the third pulley 64 and brushes tangentially the second pulley 61, so that the third pulley 64 is enclosed in the second closed path, while the second pulley 61 is external to said second closed path.
  • the pulleys 61, 64 rotate proportionally in opposite directions. Therefore, when the shaft 50 rotates, the blades 40, 41 are also proportionally rotated in opposite directions. As already mentioned, the blades 40, 41 may rotate at a variable speed, in view of the possibility of variation of the speed of the motor means 5.
  • the transmission means 6 may also allow to transmit the rotation of shaft 50 also to the movement means 3.
  • the transmission means 6 may comprise a fourth pulley 65.
  • the fourth pulley 65 like the other pulleys 60, 61, 64, is configured to actuate the movement means 3. Therefore, for instance, the fourth pulley 65 may be operatively connected to the axle of the rear wheels 30 and may transmit the rotation possibly with a predetermined gear ratio.
  • the fourth pulley 65 may be expandable, thus allowing to change the speed of rotation of the cutting means 40, for instance selectively of the first blade 40 and/or the second blade 41.
  • the fourth pulley 65 if it is present, preferably it is loosely connected to frame 2, so as to rotate around a third axis 6c.
  • This third axis 6c is preferably parallel to second axis 6b.
  • the transmission means 6 comprise a third belt 66.
  • the third belt 66 is configured to connect at least one of the pulleys 60, 61, 64.
  • the third belt 66 connects the fourth pulley 65 with the third pulley 64.
  • the transmission means therefore may be weathered, or the frame 2 may comprise one or more bonnets 21.
  • one or more bonnets 21 are configured to cover the transmission means 6, so as to make them inaccessible from outside said bonnets 21.
  • the machine 1 may also comprise additional elements.
  • the machine 1 may comprise control means 7.
  • the control means 7 are preferably configured to allow a remote control of the machine 1, or they may comprise a support structure 70 integral with frame 2, and a handle 71. This handle may be configured to allow the user to move the frame 2 at least in one direction.
  • the machine 1 comprises a second blade 41 with variable section and profile allowing, by rotation in the opposite direction, to grind the material cut by the first blade 40, with a different speed and more efficient and efficacious results.
  • the lawn mower 1 comprises a simple and efficient mechanism of motion transmission.
  • the transmission means comprise only belts and pulleys and do not include gears or other complex elements such as gearboxes.
  • the cutting means 4 may comprise additional blades or other means configured for grinding, that may be configured to rotate jointly with the first blade 40 or the second blade 41.
  • the transmission means 6 may be configured to move also the additional blades and/or the grinding means.
  • first blade 40 might also be a brush and the second blade 41 might be replaced by means for grinding the leaves.
  • the blades 40, 41 are provided for cutting grass filaments and obviously the leaves on the grass mantle.
  • the blades 40, 41 may comprise any kind of materials, for instance metals, more particularly steel, or polymers and other means, and may have any shape.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Harvester Elements (AREA)
  • Transplanting Machines (AREA)
  • Soil Working Implements (AREA)
EP22173069.0A 2021-07-12 2022-05-12 Tondeuse à gazon Pending EP4118946A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000018350A IT202100018350A1 (it) 2021-07-12 2021-07-12 Macchina tosaerba

Publications (1)

Publication Number Publication Date
EP4118946A1 true EP4118946A1 (fr) 2023-01-18

Family

ID=77989928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22173069.0A Pending EP4118946A1 (fr) 2021-07-12 2022-05-12 Tondeuse à gazon

Country Status (2)

Country Link
EP (1) EP4118946A1 (fr)
IT (1) IT202100018350A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385043A (en) 1965-02-19 1968-05-28 Bush Hog Inc Rotary mower
US5012633A (en) 1989-04-03 1991-05-07 Honda Giken Kabushiki Kaisha Lawn mower
US5177942A (en) * 1991-08-15 1993-01-12 The Toro Company Mower deck with improved belt drive arrangement
US5769747A (en) * 1996-09-05 1998-06-23 Deere & Company Belt tensioning mechanism with stop feature
EP1175821B1 (fr) * 2000-07-28 2004-07-21 Société d'Applications de Mécaniques Agricoles (SAMAG) S.A. Tondeuse à moteur pour gazon équipée d'un dispositif d'entraínement en rotation d'une lame de coupe
US7779617B2 (en) * 2008-06-11 2010-08-24 Jiangsu World Plant-Protecting Machinery Co., Ltd. Sliding pulley drive mechanism in cutting platform of lawn mower
US20120137644A1 (en) * 2009-06-02 2012-06-07 Husqvarna Ab Telescoping of cutting deck
US20170181376A1 (en) * 2015-12-24 2017-06-29 Kubota Corporation Mower deck with tilted idle pulleys
US20170245432A1 (en) * 2016-02-29 2017-08-31 Honda Motor Co., Ltd. Lawn mower
US10548263B2 (en) * 2016-12-09 2020-02-04 McCormick Technical Consulting, LLC Blade clutch actuator (BCA) with overload slip clutch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2767157B2 (ja) 1990-09-11 1998-06-18 本田技研工業株式会社 回転式芝刈機

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385043A (en) 1965-02-19 1968-05-28 Bush Hog Inc Rotary mower
US5012633A (en) 1989-04-03 1991-05-07 Honda Giken Kabushiki Kaisha Lawn mower
US5177942A (en) * 1991-08-15 1993-01-12 The Toro Company Mower deck with improved belt drive arrangement
US5769747A (en) * 1996-09-05 1998-06-23 Deere & Company Belt tensioning mechanism with stop feature
EP1175821B1 (fr) * 2000-07-28 2004-07-21 Société d'Applications de Mécaniques Agricoles (SAMAG) S.A. Tondeuse à moteur pour gazon équipée d'un dispositif d'entraínement en rotation d'une lame de coupe
US7779617B2 (en) * 2008-06-11 2010-08-24 Jiangsu World Plant-Protecting Machinery Co., Ltd. Sliding pulley drive mechanism in cutting platform of lawn mower
US20120137644A1 (en) * 2009-06-02 2012-06-07 Husqvarna Ab Telescoping of cutting deck
US20170181376A1 (en) * 2015-12-24 2017-06-29 Kubota Corporation Mower deck with tilted idle pulleys
US20170245432A1 (en) * 2016-02-29 2017-08-31 Honda Motor Co., Ltd. Lawn mower
US10548263B2 (en) * 2016-12-09 2020-02-04 McCormick Technical Consulting, LLC Blade clutch actuator (BCA) with overload slip clutch

Also Published As

Publication number Publication date
IT202100018350A1 (it) 2023-01-12

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